I second the more practice idea. When learning coreo I break it down and drill sections, it gets the moves into you muscle memory so you don't need to think/see/hear anything but the music and the audience. It helps when you have to preform and be all emotionally involved. Drilling also makes transitions nicer and neater.

I had one teacher that would make us do just the foot work a million times, then add the hips and do just footwork and hips, then add upper body and finally arms. I like that order because if I forget something its going to be the arms and arm movements come pretty natural to me so its easy to fake, at least easier than grapevines, spins and ball changes

Also talking to yourself (silently!) while you are performing the moves can help greatly. In a former life, when I still did ballet, we were required to know every movement by its name. As you progress through to more advanced classes, the instructors demonstrated less and less, eventually only telling you the string of movements that would make up the combo. If your instructor doesn't give everything a name, make one for yourself and repeat it in your head every time you do the movement. Then the name also becomes part of your "muscle memory".